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PLC的各種功能主要是通過(guò)運(yùn)行控制程序來(lái)實(shí)現(xiàn)。編制程序時(shí)，需要合理使用PLC提供的編程元件（即軟元件）。FPO型PLC中常用的編程元件有兩種：位元件（bit）和字元件（word）。位元件實(shí)際上是PLC內(nèi)存區(qū)域所提供的一個(gè)二進(jìn)制位單元，又被稱(chēng)為軟繼電器，主要用作基本順序指令的編程元件，如輸入繼電器Xn、輸出繼電器Yn、內(nèi)部通用繼電器Rn、定時(shí)（計(jì)數(shù)）器等，其參與控制的方式主要是通過(guò)對(duì)應(yīng)觸點(diǎn)的通斷狀態(tài)改變影響邏輯運(yùn)算結(jié)果即輸出。
字元件則為PLC內(nèi)存區(qū)域內(nèi)的一個(gè)字單元（16bit），主要用作功能指令和指令的編程元件，通常用以存放數(shù)據(jù)，如數(shù)據(jù)寄存器DTn，定時(shí)(計(jì)數(shù))器的設(shè)定值SVn、經(jīng)過(guò)值EVn等。字元件沒(méi)有觸點(diǎn)，通常以整體內(nèi)容參與控制。
值得注意的是內(nèi)存中的輸入（X）區(qū)、輸出（Y）區(qū)和內(nèi)部通用（R）區(qū)，該區(qū)中的每個(gè)bit均可用作位元件，而且每16bit可構(gòu)成一個(gè)字元件，如WRIO即是由16個(gè)位元件R100～R10F構(gòu)成的字元件，該字元件中的內(nèi)容一旦發(fā)生變化，這16個(gè)位的狀態(tài)也隨之發(fā)生改變.
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廈門(mén)莫格電氣自動(dòng)化有限公司
張芳（銷(xiāo)售工程師）
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JAMESBURY 6" VALVE ACTUATOR VPVL450 DA B C W/ PNEUMATIC POSITIONER P-2000, NEW
BELL & GOSSETT 125 PSI 225???’?￠a???????a€????°F 3/4" NPT REDUCING VALVE, B7-12
SMC 0.1-1.0MPA 3/8"NPT 3 PORTS HAND VALVE VHS400-03-X1 *NEW*
MILWAUKEE VALVE CO. 1500 WOG CF8M STAINLESS STEEL BALL VALVE 1-1/2"
SWAGELOK TUBE FITTING S-810-R-16 *NEW,SEALED* LOT OF 2
PARKER 1/4"NPT 1/8"NPT BRASS union TEE X164P-6-4 *NEW LOT OF 10*
FLOW TECHNOLOGY 1/2" NPT, OMNIFLO PROPORTIONAL FLOW SENSOR FTO-5NINB-LHA-1?020
BOSTON GEAR REGULATOR 1/4" AND 1/8" PORT 100/300PSIG EN42120
EMERSON 5/8"ODF EXTEND SOLENOID VALVE 200RB 6T5T NIB
BRASS 1-1/2" CHECK VALVE 200S
NUMATROL 5/2 DETENTED, 1/8" NPT, PNEUMATIC RELAY VALVE RA7-0103 *NEW, SEALED*
SHARPE 1/4" 200 SWING VALVE CF8M NNB
CDI 3/8 2-WAY BRASS VALVE BODY
LUNKENHEIMER 200 WOG 1-1/4" NPT CHECK VALVE, 125SP *NEW*
CDI 3/8 2-WAY BRASS VALVE BODY
LUNKENHEIMER 200 WOG 1-1/4" NPT CHECK VALVE, 125SP *NEW*
CRANE 2 1/2" GATE VALVE 200S 400 WOG
FESTO 13-145PSI SOLENOID VALVE MEH-5/3E-1/8-S-?B
SMC 1" NPT, 1.0MPA MAX, 60oC, PNEUMATIC FILTER AF60-F10C *NEW*
PARKER HYDRAULIC VALVE 493-8D1-2
FISHER CONTROLS SIZE 1-1/8" TYPE ET ACTUATOR VALVE 13933474
VICKERS 5000PSI 5 POLE PRESSURE CONTROL VALVE DG4V-3S-2AL-M-F?PA5WL-B5-60 *NEW*
ALOYCO 150 CF8M STEEL GATE VALVE 117
PARKER 3.00GPM 3000 PSI 1/4" NPT FLOW CONTROL VALVE, PCK-400S *NEW*
SMC 7-150PSI 3/8IN. NPT 1/4IN. NPT 60C MIST SEPARATOR NAM250 *NEW NO BOX*
PARKER 1/2 INCH, LOW PRESSURE FITTING union 62PBH-8 *NEW, LOT OF 2*
NIBCO 1/2", MALE, VALVE *NEW, LOT OF 2*
WATSON / McDANIEL 3/4" NPT INVERTED STEEL TRAP 1032 *NEW*
G.I.E. 1IN. NPT WEIR STYLE CAST IRON DIAPHRAGM VALVE WTCX223M1.0 *NEW*
NUMATICS 14.5-145 PSIG-AIR 1/4" NPTF SOLENOID VALVE, L12PP552O000000 *NEW*
KEYSTONE 4" SIZE, 175 PSI WAFER BUTTERFLY VALVE AR1
STAINLESS STEEL 3/4" SHUT-OFF GATE VALVE
BARBER COLMAN 5-10 PSIG 1/2" NOM. STROKE PNEUMATIC ACTUATOR, MK-4611-0-0-2
DYNAQUIP 1/8"NPTM ONE WAY SHUT OFF VALVE P321 *NEW LOT OF 12*
BABBITT SIZE 2-1/2 CAST IRON WILL FIT VALVE WHEELS 9-1/4
KITZ CLASS 200 1/2" NPT CHECK VALVE, 304S13A
OTHER * APOLLO BALL VALVE 3/4" * 70-104-01
FNW VALVE CO. CLASS 150 316SS CF8M SIZE 8" KNIFE GATE VALVE MODEL 2000BT
ELBOW VALVE MALE/FEMALE 1/2"NPT #12 * NEW LOT OF 6*
HENRY VALVE COMPANY 1/2" SHUT-OFF VALVE 5164 *NEW*
NUMATICS 1/4"NPT 2 PORTS FREE FLOW VALVE 2FC2 *NEW*
ARO 1/8"NPT, 3-PORT, MINIATURE LIMIT VALVE 215-C *NEW*
CIRCLE SEAL 800PSI CHECK VALVE 2232B-4SS *NEW, IN BOX*
VICKERS VALVE DG4V-3S-2N-M-FP?A5WLB5-60
PARKER 1/4" BALL VALVES W/ TUBE FITTINGS CF8M K *NEW*
FF 1 1/4X1 1/2 BELL REDUCER LOT OF 6
ASCO 1/4", 120V, 60Hz, SOLENOID VALVE 8302A 81U *NEW*
VICKERS DG4V-3S-2A-M-FT?WL-B5-60 SOLENOID OPERATED DIRECTIONAL VALVE
ROVALVE 8" CF8M KNIFE GATE VALVE SS-08 S
WATTS REGULATOR BALL VALVE CF8M STAINLESS STEEL 1-1/2"
PRINZING 1"TO 2-1/2" LOCKOUT SD02 *NEW*
ROSS CONTROLS 24VDC 2-8 BAR SOLENOID VALVE, W6077A2957 *NEW SEALED*
NUMATICS 1/4" NPT SOLENOID VALVE W/ BASE, 11DPS4430 *NEW*
CAMOZZI 10BAR 2-WAY VALVE RFO 382-1/8
NIBCO 2000 WOG 1/2" NPT CF8M BALL VALVE, T580S6R6 6 *NEW*
PROTECTOSEAL CO. 2" X 3-1/2" BREATHER VALVE 8542-1-42C
SHARPE 3/8" 1000CWP BALL VALVE CF8M / 201 1L
NICHOLSON 0-200PSIG 3/4" STEAM TRAP G-5 / A-42
NUMATICS 1/4" NPT PRECISION LIMIT VALVE, 0HA4-B *NEW*
C.F.F. 200 PSI 3/4 INCH NPT STAINLESS STEEL GATE VALVE, SS-6
GRINNELL 3/8"X3/4" BELL REDUCER LOT OF 5
CRANE 3/4"NPT 150 S 300CWP BRONZE BALL VALVE 7 TF
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